Rack Unit Calculator

What is rack unit calculator?

Knowing how much Rack Unit space you require is very important when installing 19" Rack Cabinets & Enclosures. The 19 Inch Rack Calculator below can convert inches and mm into Rack Units. It can also convert Rack U's into Inches and mm. This is a very useful tool for any installer or musician who needs to know exactly what equipment to buy when building a 19" Rack. Each U or Rack Unit is equivalent of 1.75" and is used as the standard terminology for describing sizes with 19 inch rack cabinets.

What is a “U” or “Rack Unit”?

A rack unit (abbreviated as U, less commonly seen as RU) is a unit of measurement applied to equipment racks and the servers, disk drives and other devices that they contain. One U is 1.75 inches (44.45mm); the standard rack, at 19 inches, is 42U.

Rack servers and other hardware designed to be rack-mounted are manufactured in multiples of 1.75 inches and specified in multiples of rack units, usually 1U, 2U, 3U or 4U. Racks are designed to hold equipment of those sizes. The holes in the mounting flanges of racks are arranged in groups of three, and that three-hole grouping is also called a rack unit.

Rack units for equipment is considered maximum dimensions. In practice, devices are often made slightly smaller than the specified U value to allow a little space. A device specified as 2U, for example, may in reality measure 3.44 inches in height, rather than the 3.5 inch multiple of 1.75.